package org.glvnsjc.webapp.util;

import javax.faces.context.FacesContext;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Convenience class for setting and retrieving cookies.
 */
public final class RequestUtil
{
    private static final Log log = LogFactory.getLog( RequestUtil.class );

    /**
     * Checkstyle rule: utility classes should not have public constructor
     */
    private RequestUtil()
    {
    }

    /**
     * Convenience method to set a cookie
     *
     * @param response the current response
     * @param name the name of the cookie
     * @param value the value of the cookie
     * @param path the path to set it on
     */
    public static void setCookie( HttpServletResponse response, String name, String value, String path )
    {
        if ( log.isDebugEnabled() )
        {
            log.debug( "Setting cookie '" + name + "' on path '" + path + "'" );
        }

        Cookie cookie = new Cookie( name, value );
        cookie.setSecure( false );
        cookie.setPath( path );
        cookie.setMaxAge( 3600 * 24 * 30 ); // 30 days

        response.addCookie( cookie );
    }

    /**
     * Convenience method to get a cookie by name
     *
     * @param request the current request
     * @param name the name of the cookie to find
     *
     * @return the cookie (if found), null if not found
     */
    public static Cookie getCookie( HttpServletRequest request, String name )
    {
        Cookie[] cookies = request.getCookies();
        Cookie returnCookie = null;

        if ( cookies == null )
        {
            return returnCookie;
        }

        for ( Cookie thisCookie : cookies )
        {
            if ( thisCookie.getName().equals( name ) )
            {
                // cookies with no value do me no good!
                if ( !thisCookie.getValue().equals( "" ) )
                {
                    returnCookie = thisCookie;

                    break;
                }
            }
        }

        return returnCookie;
    }

    /**
     * Convenience method for deleting a cookie by name
     *
     * @param response the current web response
     * @param cookie the cookie to delete
     * @param path the path on which the cookie was set (i.e. /appfuse)
     */
    public static void deleteCookie( HttpServletResponse response, Cookie cookie, String path )
    {
        if ( cookie != null )
        {
            // Delete the cookie by setting its maximum age to zero
            cookie.setMaxAge( 0 );
            cookie.setPath( path );
            response.addCookie( cookie );
        }
    }

    /**
     * Convenience method to get the application's URL based on request
     * variables.
     * 
     * @param request the current request
     * @return URL to application
     */
    public static String getAppURL( HttpServletRequest request )
    {
        StringBuffer url = new StringBuffer();
        int port = request.getServerPort();
        if ( port < 0 )
        {
            port = 80; // Work around java.net.URL bug
        }
        String scheme = request.getScheme();
        url.append( scheme );
        url.append( "://" );
        url.append( request.getServerName() );
        if ( ( scheme.equals( "http" ) && ( port != 80 ) ) || ( scheme.equals( "https" ) && ( port != 443 ) ) )
        {
            url.append( ':' );
            url.append( port );
        }
        url.append( request.getContextPath() );
        return url.toString();
    }
    
    public static String getRequestParam( String name )
    {
        FacesContext ctx = FacesContext.getCurrentInstance();
        Object value = //ctx.getApplication().getVariableResolver().resolveVariable(ctx, name );
            ctx.getExternalContext().getRequestParameterMap().get( name );
            //ctx.getApplication().createValueBinding( "#{param." + name + "}" ).getValue( ctx );
        return (String) value;
    }
}
